William a



(No Model.)

W. A. TURNER..v

KNOB.

NQ. 433,108. Patented July 29, 1890.

@UV/Mm 0,0010/ USGA/m01,

AUNITED STATES PATENT OFFICE.

VILLIAM A. TURNER, OF \VORCESTER, MASSACHUSETTS, ASSIGNOR TO EDMUNDCONVERSE, OF SAME PLACE.

KNOB.

SPECIFICATION forming part of Letters Patent No. 433,108, dated July 29,1890.

Application filed May 10, 1890.

To all whom it may concern:V

Be 1t known that l, WILLIAM A. TURNER, a citizen of the United States',and a resident of Worcester, in the county of Vorcester and State ofMassachusetts, have invented a new and useful Improvement in Knobs, ofwhich the following` is a specification, reference being had to theaccompanying drawings, in which- Figure l represents an elevation of aknob embodying my invention. Fig. 2 is a central sectional view of thesame. Fig. 3 is a detached view of the spindle by which the knob isattached. Fig. 4 is a top View of the elastic washer. Fig. 5 is a sideView of the same, and Fig. 6 is an end View of the plate by which theopen end of the shell forming the body of the knob is closed.

Similar letters refer to similar parts in the different figures.

My invention relates to knobs to be used in connection with dampers orregisters, and it has for its object to produce a knob which, whenattached to the register or damper, will cause the same to press againstthe door or wall upon which the damper operates.

A denotes the body of the knob, consisting of a shell which isconveniently and preferably made from a metal sheet or blank by means ofsuitable dies and punches inthe usual manner of making sheet-metalknobs.

B denotes a circular plate closing the open end of the shell forming thebody of the knob, the edge of the shell being turned over the edge ofthe plate B, as represented at B', Fig. 2. In case the shell A is notformed of sheet metal, the plate B can be otherwise attached to theshell. The plate B is provided with an angular hole B2, (shown in thedrawings as rectangular,) to receive a spindle C,provided with anangular section C* to t the hole in the plate B. The spindle C extendsthe length of the shell A, and has a head Cl resting against the innersurface of the shell A, and a shoulder C2 to prevent the movement of thewasher D lengthwise the spindle C. The angular section C* is extendedoutside the plate B a short distance sli ghtlyless than the thickness ofdoor-plate E. The end of the spindle is screw-threaded, forming ashoulder F, and the rectangular section of the spindle is ex- Serial No.351,828. (No model.)

tended beyond the plate B far enougl1,so that as the spindle is screwedinto the damper or register G against the shoulder F the tension ofthe'spring-washer D is brought to bear on the plate B and the cndwisemotion of the spindle limited, preventing too great strain being exertedupon the washer D. The washer D is formed with the elastic prongs D',which are bent or turned downward with their ends resting upon the plateB, while the washer is held by the shoulder C2. Vhen the screw-threadedend of the spindle has been screwed into the damper or register G, theend is expanded by riveting to prevent the spindle from. working loose,and the force of the blows in riveting is received bythe head ot thespindle C, resting against the inner surface of the shell A.

The spindle represented in the accompanying drawings is shown with ascrew-threaded section F to be screwed into the damper or register plateG; but, if desired, this section can be left blank or without ascrew-thread, and the damper or register G attached by the riveting ofthe end of the spindle. In such case the angular section C* can beround, if desired, as it will not be necessary to rotate the spindle bythe rotation of the knob. The shoulder F should, however, be retained,as it limits the distance that the end of the spindle canbe drawn intothe damper-plate. Were the shoulder omitted, there would be a dangerthat the spindle might be drawn so far out of .the shell A as to carrythe elastic prongs outward against the shell A, and thereby destroy theelasticity of the spring, or so limit its action that itcould not yieldas the knob is moved over inequalities in the surface of the plate E.

The elastic washer D is cut from a piece of steel and the prongs bentinto the proper shape and tempered, and the amount of space in contactwith the spindle C and plate B is so limited that a minimum amount ofheat is communicated to the tempered prongs D through the spindle C.

That I claim as my invention, and desire to secure by Letters Patent,is-

l. The combination, with a shell forming the body of the knob andprovided with an angular hole or opening to receive a spindle,

ICO

Shell, and a Washer held 0n said spindle and prevented from longitudinalmovement thereon, and having the elastic prongs D bearing againstvthewall of the shell, substantially as described.

3. The combination of shell A, plate B, provided With a hole to receivea spindle, a spindle C, having a head C and a shoulder C2, andawasherD,having elastic prongs D, substantially as described.

Dated the 8th day of May, 1890.

WILLIAM A. TURNER. Witnesses:

E. CoNvERsE, RUFUS `B. '"FOWLER.

